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Anonymous
If they all come from the same electricity source, that would appear quite absurd to me especially since we must have thought about avoiding that.
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15 Oct 2020
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You are half right!! two lines did come from the same source due to some decisions made.
Check out the updated article here :) : https://www.straitstimes.com/singapore/attempt-...
The three lines did not break down at the same time. The EW line broke down first. To restore power, there was an attempt to draw power from Buona Vista Intake substation (BVI), but this was done without first isolating the fault, resulting in a power supply disruption to the Circle Line as well; which the substation also serves.
In conclusion, it could have been only the EW line but a few decisions made caused 3 line to breakdown in succession.